PJM Interconnection

PJM Messages Public Web Service

The only fully anonymous PJM REST API found on the public surface. It backs the PJM Upcoming Changes page and returns the current planned-outage, delayed-data and impact notices for the whole PJM eTools estate — affected applications by name and numeric id, the change window as epoch milliseconds, required actions, and an access-blocking flag. GET https://messages.pjm.com/messages/rest/public/messages returned HTTP 200 with no credential on 2026-07-27, serving application/xml;charset=UTF-8 by default and JSON under Accept: application/json. There are no documented query parameters, no paging and no filtering — it returns the current notice set as one small document. It is poll-only; PJM registers no webhooks, and the alternative subscription channel is email.

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API entry from apis.yml

aid: pjm:pjm-messages-public-api
name: PJM Messages Public Web Service
description: 'The only fully anonymous PJM REST API found on the public surface. It backs the PJM Upcoming
  Changes page and returns the current planned-outage, delayed-data and impact notices for the whole PJM
  eTools estate — affected applications by name and numeric id, the change window as epoch milliseconds,
  required actions, and an access-blocking flag. GET https://messages.pjm.com/messages/rest/public/messages
  returned HTTP 200 with no credential on 2026-07-27, serving application/xml;charset=UTF-8 by default
  and JSON under Accept: application/json. There are no documented query parameters, no paging and no
  filtering — it returns the current notice set as one small document. It is poll-only; PJM registers
  no webhooks, and the alternative subscription channel is email.'
humanURL: https://www.pjm.com/markets-and-operations/etools/upcoming-changes
baseURL: https://messages.pjm.com/messages/rest/public
image: https://www.pjm.com/assets/MVC/responsive/img/pjm-logo.png
tags:
- Status
- Notification
- Planned Outages
- Grid Operations
- Open Access
tags_raw:
- Status
- Notifications
- Planned Outages
- Grid Operations
- Open Access
properties:
- type: Documentation
  url: https://www.pjm.com/markets-and-operations/etools/upcoming-changes
- type: Guide
  url: https://www.pjm.com/-/media/etools/upcoming-changes-how-to-guide.pdf
- type: JSONSchema
  url: json-schema/pjm-message.json
- type: Examples
  url: examples/_index.yml
- type: AgentSkill
  url: skills/pjm-watch-tool-change-notices.md
- type: StatusPage
  url: https://www.pjm.com/markets-and-operations/etools/upcoming-changes